James r



J. R. MOFEATT. TAKE-UP MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY II, I916.

Patented Aug. 19, 1919.

1 O L v n Z 0 m a rs sra'rns PATENT OFFICE.

JAMES R. MOFFATT, OF CHICAGO, ILLINOIS, ASSIG-NOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TAKE-UP MECHANISM FOR SEWING-MACHINES.

Specificationiof Letters Patent.

Patented Aug. 19, 1919.

Application filed May 17, 1916. Serial No. 98,149.

a citizen of the United States, residing at Chicago, in the county of Cook, State of Ill1no1s, have lnvented certaln new and use 'ful Improvements in Take-Up Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the fig ures of reference marked thereon.

The invention relates to new and useful improvements in take-up mechanism for sewing machines, and more particularly to a take-up cam which is shaped so as to take up and give thread to the implement with which the take-up mechanism is associated, and the invention relates more particularly to a take-up cam used in connection with the looper thread such as shown in the patent to Russel G. Woodward, dated November 27th, 1906, No. 836,849.

An object of the invention is to provide means for fixing the take-up cam to its operating shaft, which means permits the takeup cam to be adjusted about its axis.

A further object of the invention is to provide means for supporting the take-up cam, whereby said take-up cam may be secured by a spot screw to its operating shaft, and whereby said take-up cam may be adjusted about its axis without shifting the position of the spot screw.

A still further object of the invention is to provide means for supporting the take-up cam so that the same may be adjusted 011 the shaft and whereby said take-up cam may be removed from the shaft and again returned to a predetermined position.

These and other objects will in part be obvious, and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of illustration one embodiment of the invention- Figure 1 is a view in perspective, showing a looper, a retainer the take-up cam, a portion of the main operating shaft and the controlling fingers and thread guides cooperating with'the take-up cam;

Fig. 2 is a front view of a portion of the shaft with my improved take up cam mounted thereon;

Fig. 3 is a sectional view through the take up cam and its support on the line 33 of Fig. 2;

' Fig. 4 is a sectional view on the line 41 of Fig. 2;

Fig. 5 is a sectional view on the line 5-5 of Fig. 2;

Fig. 6 is a view similar the take up cam shifted relative to its sup porting sleeve; and

Fig. 7 is a perspective view of the take up cam and the supporting sleeve therefor.

The invention consists broadly of a take,

up cam which cooperates with thread guides and controlling fingers to take up and give up the thread on which said take up cam operates.

The take up cam proper is mounted on a collar which, in turn, is secured to the operating shaft by a spot screw. The take up cam is secured to the collar by one or more set screws so that the take up cam may be adjusted on said collar to vary the position of the cam for changing the time of taking up and releasing the thread.

Referring more in detail to the drawings,

have shown my improved supporting means for the take up cam as applied to a take up cam for controlling a looper thread.

In Fig. 1 of the drawings, the looper is indicated at 1. A retainer which cooperates with the looper is indicated at 2. The take-up cam is indicated at 3 and said takeup cam is mounted on a shaft 4. Cooperating with the take-up cam are fingers 5, each of which is formed with a thread guide so that the thread passing through the said guides may be held in proper relation to the take-up cam 3. Said take-up cam is formed with two disks which are spaced slightly to form a recess 6. A thread finger 7 extends into this recess and cooperates with the takeup cam in controlling the thread. Check fingers 9 also cooperate with the take-up cam. These parts are similar in construction and operation to those shown in the Woodward patent above referred to, and will not need further description.

The take-up cam, as above noted, consists of two parallel spaced disks which are carried by a sleeve 10. The sleeve 10 is mounted on a collar 11 and is secured as herein shown, by two set screws 12 and 13. F errules 10 and 10 may be placed on the shaft at the ends of the collar.

The sleeve 10 is formed with an elongated slot 14 and a spot screw 15 located in said slot is carried by the collar 11 and is adapted to Fig. 5, showing:

cess in the shaft. The sleeve carrying the j take-up cam is adjustably secured to the collar 11. By loosening the set screws 12 and 13, said sleeve may be adjusted from the position shown, for example, in Fig. 5 to the position shown in Fig. 6 and thus the position of the take up cam relative to its operating shaft is varied. On the other hand after the take up cam has been properly adjusted and set, the spot screw may be released and the take up cam,

its supporting collar, removed from the shaft together with and again replaced thereon without disturbing the adjustment of the take up cam. The

adjustment of the take up cam on its sup- I porting sleeve permits the cam to be set so as toeither advance or retard the time of taking up the slack in the looper thread during the rear stroke of the looper or atany other time desired. v I

It is obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims;

Having thus described my invention, what copies of this patent may be obtained for five cents each, by addressing the Washington, D. 0.

in the I. claim as new and desire to secure by Letters Patent, is

1. The combination of a shaft, a take up cam having a supporting sleeve, a support, means for fixedly securing said support to the shaft in a predetermined position thereon and means for adj ustably connecting said sleeve to said support whereby said sleeve may be adjusted about said shaft for chang ing the time of action of the take up surface of the take up cam.

, 2. The combination ofa shaft, atake-up cam having a supporting sleeve, a support located within said sleeve, means for fixedly attaching said support to said shaft, and

means for adjustably connecting said sleeve to said support. a

3. The combination of a shaft having a recess, a take-up cam having a sleeve provided with a slot, a collar within said sleeve,-

a set screw for fixing the sleeve to said collar, a spot screw passing through said slot in the sleeve and through said collar and into said recess.

In testimony whereof, I affix signa. I ture in the presence of two witnesses.

JAMES R. MOFFATTJ Commissioner of Patents, 

